Inflation head



P. D. GRAVES INFLATION'HEAD Filed Jan. 11,

Inventor 2. 2. QWm ew q fltzarmy KK A? June 18, 1929.

Patented June 18, 11. 229.

UNlTED S'lAllES 1,717,842 rarest rricn.

PAUL D. GRAVES, OF LUMBEBTG'N, NOR-TH CAROLINA, ASSIGNOB OF ONE-HALF TO NICK JOHNS, OF HAMLET, MGR-TH. CAROLINA.

INFLATION HEAD.

Application filed January 11, 1927. Serial No. 160,510.

This invention relates to what is common ly referred to in the art as an inflation head the same being adapted for use on air pressure supply hose such as are used at filling stations and the device including gage means for controlling and indicating pressure of air admitted to a tire.

Briefly, the invention has reference to an improved device embodying a main chamber having valve at one end through which the air from the hose enters, this chamber serving to accommodate novel automatically op erable control means for cutting off the supply of air when a predetermined pressure has been reached, the casting also including an auxiliary chamber connected with the main chamber through a passage and this auxiliary chamber being formed with a safety valve and being adapted to be connected with the tire valve.

My principal aim is to generally improve upon devices of this class by providing one of comparative simplicity and durability wherein novel parts are employed which are associated with each other in such a way as to produce a practical and highly efficient structure.

Other objects and features will become apparent from the following description and claim.

In the accompanying drawings forming a part of this application and in which like numerals employed to designate like parts throughoutthe same Figure 1 is a longitiulinal section through a head constructed in accordance with the present invention Fig. 2 is a fragmentary plan View of one end portion of the device.

Referring to the drawings in detail, it will be seen that the reference character 1 designates generally the metal casting which includes a cylindrical portion forming the main air chamber 2. This chamber is open at its opposite ends and communicates with the auxiliary chamber 3 through the medium of a port 4. The chamber 3 is formed in a part of the device having a downturned end 5 which is adapted to fit upon the tire valve in a conventional way. Fitted inthe opposite end of the chamber 3 is an outwardly seating valve 6 including a spring pressed stem 7 with which the laterally directed end 8 of an operating rod 9 is engaged. The rod 9 is guided in the device so as to be capable of longitudinal movement and is provided at its opposite ends with angularly disposed portions as clearly shown in Figure 1. The manner in which this red is actuated will be clear from the following description.

Fitted into the right hand end of the tube in which the chamber 2 formed is a collar 10 through which a screw threaded shank 11 passes from an operating finger piece 12.

'lhreaded on this shank is a disk 13 carrying a finger 14 slidable in a gage'slot 15. Referring to Fig. 2, it will be seen that this slot is provided along one side with graduations with which the finger 1 L cooperates as a pointer to indicate the pressure imposed upon a coiled spring 16 which bears at one end against the disk 13. The spring 16 bears at its opposite end against a flange formed on a metallic cup 17 which is slidable in the main chamber 2. An angularly disposed end portion 8 of the rod 9 is disposed innnediately in front of the flange on cup 17 so that when said cup 17 is moved forwardly, the rod 9 will be moved in the same direction.

Fitted into this cup is a thrust member in cluding a circular plate 18 and a threaded part 19. 'A spring 20 is connected at one end to this part 19 and at its opposite end. with a second collar 21 threaded into the tubular part of the casing cylinder. There is also a washer 22 fitted into the tube and a guide 23 is interposed between these parts. Moreover, the flanged end of a rubber tube 24': is arranged between the guide 23 and the collar 21 and this tube is surrounded by the coiled spring 20, and one end of the same extends into the aforesaid cup 17. A valve operating stem 25 is arranged in this rubber tube 24 and has one end provided with a head bearing against the closed end of the tube and has its opposite end extending through the guide 23 and arranged against the forward end of the stem of a springpr'essed forwardly seating valve 26 carried by a fitting 6 screwed into the rear end of the chamber 2 and adapted for the connection of a base or the like leading from a source of compressed air supply. The valve 6 is preferably of the conventional construction employed in the inflation tube of pneumatic tires.

The operation of the improved device is as follows :-The spring 16 which serves to elongate it.

move the cup 17 in a direction from. right to left is first adjusted by turning the stem 11 and feeding the follower or disk 18 on the stem. The finger 14 carried by this plunger cooperates with the graduations on the slot 15 to indicate the approximate tension of the spring. Obviously, this moves the member 25 in a direction to open the valve 26. The incoming air enters the chamber 2 and passes through the port 4 into the chamber 3, from where it escapes through the nozzle 5 into the tire in an evident man ner. At the same time, a portion of the air enters the rubber tube 24 and tends to As the air fills this tube and elongates it, it will move the cup 17 and in so doing, the rod 9 will be pulled with the cup and will open the valve 6 to permit escape of excess pressure to the atmosphere and thereby prevent undue pressure from entering the tire. The described movement of the cup 17 toward the right will allow movement of the operating member 25 in the same direction whereupon the valve 6 will be closed.

It is believed that by considering the description in connection with the drawings, persons familiar with devices of this class will be able to obtain a clear understanding of the same. Therefore, a more lengthy description is thought unnecessary.

Minor changes coming Within the field of invention claimed may be resorted to if desired.

Having thus described my invention, What I claim as new is In an inflation head and in combination, a main chamber adapted to be connected with a source of compressed air supply, an auxiliary chamber, a port connecting said chamhers, an outwardly seating valve in the auxiliary chamber in rear of said port, a rubber tube in the main chamber, a flanged cap on said tube, adjustable spring means for resisting movement of said tube and cap, and a member movable by the flanged cap to open said valve.

In testimony whereof I afiix my signature.

PAUL D. GRAVES. 

